Can body and method of forming the side seam thereof



1927. c. STOLLBERG CAN BODY ANDv METHOD OF FORMING THE SIDE SEAN THEREOF 2 Sheets-Sheet 1 Filed April l 6, 1925 ATTORNEY u 7 1,625,229 APrll 9' ...STOLLBERG CAN BODY AND METHOD OF FORMING THE SIDE SEAM THEREOF Filed April. -l6. 1925 I 2 Sheets-Sheetz GM W BY 1% M 9% ATT RNEY Patented Apr l9, N27.

terrain stares eraser oneness srornnnno, or new ronzrgis. a, .essronon 'ro anemone can corrrnrrr,

. or new roan, It. vi, a season-arrow or new senses,

can BQDY EETHQD G1? FQREEING THE SEAM armor.

Application filed April 28, 1925. Serial No. eases.

My invention relates to themanuiacture of cans, and more particularly to the method of forming the side seam thereof.

With the recent developments of can mak ing machinery, there has been a marked increase in the s eed attainable in the processes of menu acture and, whereas only a few years ago the rate of production for one machine was about 100 cans per minute, it is not unusual, with the new machinery, to produce upon a single autom'atic machine 300 cans per minute. With this enormous speed, certain difliculties have been encountered, one of which is the trapping of air within the side seam of the can body when the solder is applied thereto, with the result that unsoldered spaces, or islands, occur in. the seam and impair the strength thereof. This difiicully has been experi enced more particularly in connection with the so-called loclr and but inasmuch as the ends or the lock orcase of a lap tion of theseam are closed when'saide ges are interengaged, there is more likelihood or I V H I is ahrokenolan view at a can hotly ,Ii

trapping the air during the soldering operation,

applied at the very rapid rate now attained,

the ends of said lock portion of theseanr are instantaneously closed oil, or sealedhyf the solder, which, passing edgewise into the 1 central art of the seam, in some cases actually pocliets or entraps a certain amount of air; This entrapped air, being subject to the intense heat of the solder hath, rapidly expands and thus forms an increased harrier 7 to the entrance of solder into the seam, with the result heretofore mentioned.

. The urpose of my invention overcome t is difiiculty by providing tor the escape of the air from the seam during operations thereon which might tend to entrap it, the operation particularly afiected hein that of soldering, as hereinbefore indicated.

Numerous other objects and advantages of the invention will be apparent as it is better understood from the following de scription, which, taken in connection with lap type of scam, in which the central portions of the op .i posed edges are interengaged and the end.

since it cannot readily escape as in the seam. When the solder. is p the seam produced by the form of: blan Y the accompanying drawings, discloses a preferred embodiment thereof. Referring to the drawings,

Figure 1 is a perspectiveview of a can body formed with a lock and lap seam einbodying the preferred form of my invention, winch preferred form isfurther illustrated in Fig. 5;

Fig. 2 is a {perspective fragmentary view or the oppose edges entering into the lock and lap scam, the view illustrating the parts no se arated relationshi for the purpose of clear y disclosing the c annel for reception of the solder;

Fig. 3 is a perspective fragmentary view of a soldered side seam, partially torn open, the view illustrating the imperfect sweatmg of the'seam and the islands caused by the trapping or air within the inner folds oi the seam; A

Fig. d is a cross-sectional view or a portion or the can body within a itorming mendrel and illustrating the manner in which the solder is applied to the seam hy the solder roll;

Fig. 5 is a partial sectional'view or a h-ody, showing the seam illustrated in has-been applied;

preferred form or side shown'in' Fig.6; I p Fig.3 is a broken plan viewer another modified iormof blank; and

isi 9 is'a view corresponding to Figs. 5 and showin the modi ed form of blank illustrated in ig. 8Q

Upon said drawings, illustrating the best manner in which I have thus far contemplated applying the rinciples of my invention, the reference c aracter 11 indicates a can hody formed with a lock and lap seam, the lock portion being indicated, generally, by the reference character 12 and the lap portions by the character 13. The edges of the body 11 are hooked at 1% and 15 (see Fig. 2) and are adapted to be interengaged,

as shown in Figs. 5, 7 and 9, prior to the 1 application of the solder. A channel 16 is formed in the edge having the hooked portion lei and is adapted to receive solder from oppiyi port oil or in rhino end is ide seem, in driven, the

21) i tn the thereby cdrried up from s. directed into the chnnnel stoted the projection o'lt chonnei the high rote the present rnochines tends to end nor-ts iii of the channel 16, orword edge thereof, thus dope of air contained with "no seem, with the resiilt that l moves or isinnds, indientod hv vn i cherncter ill in his fl, oecnr.

ti /811E351 oi as previously started, the dilt tinted hy the hict that the odneed h the molten solder on of the air, thus increasing lered entices.

a e termed in he ehnnnel to estnhlish chonnel while the nto the letter end he driven out hr the Mt not only eonipleteiv" hnt' lin l" tills the de hotly hlnnlr ll. rined rn'iteired. it" the usual inn; pnssogres, as "i". through which the oir ler is directed in from he ehnnhei. Another "notion snitnhle for at the invention is shown oi the nsnel. hlnnlr hieh ore need in the v e hooked the sesrn hove. heen intcrengntged, not}? escnne thronqh these the solde "otion nod A he coln'pl hd bf. the

will Wit h jeotiontthle "ion and l he inden "dption. end. chnnges new v n1 ono ernsrls n'iihont de'i rtingr and scope of the in! ention,

"erred torin oi 941 new to? r or secritiein oil of its nloteriel advantages.

the :torm lIQIBlIIlJQLtUIB described being merely s. preferred embodiment thereof.

1 claim:

i. The method of forming side seams of con bodies, which consists in interengaging the edges of a blank provided with air vents in the seam ores, and applying solder in fluid condition and from the exterior of the seam to the interengoged edges in direction to drive the air therefrom through said vents.

2. The method of forming side seams of con bodies which consists in interengnging the edges of a blank provided with air vents in the seam ores, and directing solder in fluid condition and from the exterior of the seam into the seem in direction to drive air which might otherwise be trapped therein out through said vents.

3. The method of forming side seams of con bodies which consists in interengaging the edges of it blank provided with a vent adopted to permit the escape of air from the seem when solder in fluid condition is applied externally to the seam and flows into the some.

The method of forming side seams of rality oir vents formed at intervals in the length of the seam and adapted to per" niit of air therefrom when solder in fluid condition is ap lied externally to the seam and flows into t e some.

G. 'lho method of forming side seams of can bodies which consists in interenguging theedges oi it hlnnk provided with a pluroiit v of air vents formed at intervals in the length of the seam and adopted to permit escape of air therefrom, and subse uently applying; solder in fluid condition on from the exterior of the seam to said seem in direction to drive oil which {night otherwise be troppcd therein out through said vents. T. The method of forming lock and lop side seems on con bodies which consists in interengeg'ing the hooked portions of the hlonlr edges, the letter being provided with nir vents at intervals in the length thereof, end applying solder in fluid condition and from the erterior of the seam to the seem in direction to drive air which might otherwise trapped therein out through said vents.

it. can hody hlnnlr, comprising a body hovinn; hooked edges adapted to be interento fornia side seam and being provided with an' air vent in the seam area to having hooked edges ada permit escape of air from said seam during 7 i the process of closing the latter when solder in fluid condition is applied externally to the seam and flows into the same.

9. A can body blank,

gaged to 'form aside seam and being provided with a plurality of air vents in the seam area to rmit escape of air from said seam during t e proeess of closing the latter when solder in fluid condition is applied externally to the seam and flows into t e same.

10. A' can body blank, comprising a body.

having hooked edges adapted'to be interenga' ed to form a side seam and being prov yi ed with a plurality of air vents formed com rising abody pteti to be interem' 11." A can body blank, comprising a bodypart having opposed edges hooked throughhooke portions of the edges bein adapted to be interengaged to form the 105i partoi the seam and the remaining ortions of said seam adapted to'be merely apped to form the lap portion of the seam, said blank beout a dpart only of the length thereof, the

ing provided with vents in the seam area adapted to permit escape of air from said seam during the process of closing the latter.

, I CHARLES STOLLBERG. 

